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It means similarities between two or more things... Is that what you were looking for?
Answer:
From a state of endangerment, many languages become extinct. When the speakers of a language are exterminated as what happened to Tasmanians in the 19th century, several languages suddenly died. Another reason for the extinction is the pressure exerted on a community to incorporate with a more powerful or larger group.
A. A was deposited most recently in the diagram above, as it is located in the top, showing that is the newest layer to be added.